It is always a challenge to reconfigure and resize existing reboilers, especially vertical thermosiphon ones, for the revised design and operating conditions of a brownfield project, since hydraulics external to the reboiler must match the reboiler hydraulics under the revamped conditions to ensure trouble-free operation.
Double-pipe and multitube (also called hairpin) heat exchangers, with their compactness and ability to optimize thermal performance without compromising maintainability, are finding increasing accepta..